A Reliable Data Transmission (rdt) bridge written in Go. Described in htc's lab document.
Alice listens on 127.0.0.1:7000, accepts a request and forwards it to tunA on 172.19.0.1:5555.
Bob listens tunB on 172.20.0.1:5555, accepts a request from Alice and forwards it to the Web Server on 127.0.0.1:8000.
When Web Server accepts the request, it sends back the response reversely.
Step0. To clone and run this repository you'll need Git and golang environment installed on your computer. From your command line:
# Clone this repository
git clone https://github.com/geeeeeeeeek/rdt.git
# Go into the repository
cd rdtTo continue working on the code, you can open the project in IntelliJ IDEA with this plugin.
Step1. Set up and run transfer to simulate a tunnel with latency and packet loss:
sudo ./network-pj1/Release/transfer-on-your-platformStep2. Build the Go package:
go build -o lab1 ./srcThere should be a binary file lab1 generated in your working directory.
Step3. Run Alice and Bob:
./lab1 --bob
./lab1 --aliceRemember to run Bob ahead of Alice. Or the socket could not be initialized.
Step 4. Use wget or axel to test downloading performance (suppose your nginx server has been running on 127.0.0.1:8000 with a 100M file):
# Single-thread download
wget 127.0.0.1:7000/100M -O 100M.test
# Multi-thread download
axel -n 64 http://127.0.0.1:7000/100M -O 100M.testYou can use diff to verify the result.
A sample test with all commands running.
So easy with golang. The code is less than 100 lines.
Take Alice as an example, establish a TCP socket that listens 127.0.0.1:7000 and dials 172.19.0.1:5555. Use goroutine to handle multiple connections.
go HandleTransmission(A, B, "A to B")
go HandleTransmission(B, A, "B to A")A goroutine is a lightweight thread managed by the Go runtime. go f(x, y, z) starts a new goroutine running f(x, y, z) The evaluation of f , x , y , and z happens in the current goroutine and the execution of f happens in the new goroutine.
Test environment:
os: Mac OS X 10.11.4
go: go1.6.2 darwin/amd64
axel: Axel version 2.5 (Darwin)
wget: GNU Wget 1.17 built on darwin15.0.0Test result:
| Speed Limit | Delay | Packet Drop Rate | Threads | Overall Speed | Efficiency |
|---|---|---|---|---|---|
| -- | -- | -- | 1 | 580 Mbps | -- |
| -- | -- | -- | 64 | 306 Mbps | -- |
| 100 Mbps | -- | -- | 1 | 82 Mbps | 82% |
| 100 Mbps | -- | -- | 64 | 95 Mbps | 95% |
| -- | 10 ms | -- | 1 | 47 Mbps | -- |
| -- | 10 ms | -- | 64 | 152 Mbps | -- |
| -- | -- | 10% | 1 | 1.2 Mbps | -- |
| -- | -- | 10% | 64 | 1.2 Mbps | -- |
| 100 Mbps | 10 ms | 10% | 1 | 0.6 Mbps | 0.6% |
| 100 Mbps | 10 ms | 10% | 64 | 0.5 Mbps | 0.5% |